title: Immunoglobulin M antibodies against CRA and FRA recombinant antigens of Trypanosoma cruzi in chronic chagasic patients.
abstract: Previous works of our research group have demonstrated aspects of the humoral immune response of chronic Chagas disease using the cytoplasmatic repetitive antigen (CRA) and the flagellar repetitive antigen (FRA) of Trypanosoma cruzi. The aim of this work was to analyze the presence of specific immunoglobulin M (IgM) antibodies in chronic chagasic patients using these recombinant antigens of T. cruzi. The positivity of IgM in chronic chagasic patients against CRA and FRA antigens was determined by indirect enzyme-linked immunosorbent assay. We reported no statistical significant differences between the levels of IgM for both recombinant antigens and the different chronic clinical forms of Chagas disease. However, a small proportion of chronic chagasic patients analyzed in this study was positive for this antibody isotype. The findings of this study indicate that the IgM antibodies cannot be used to elucidate the differences in the profile of humoral immune response among chronic chagasic patients with different clinical forms using the CRA and FRA recombinant antigens of T. cruzi.
authors.affiliation: Departamento de Imunologia, Centro de Pesquisas Aggeu Magalhães/Fiocruz, Recife, Brazil.
authors.forename: Romero H T
authors.initials: RH
authors.lastname: Vasconcelos
authors.forename: Elisa A N
authors.initials: EA
authors.lastname: Azevedo
authors.forename: Maria G A M
authors.initials: MG
authors.lastname: Cavalcanti
authors.forename: Edimilson D
authors.initials: ED
authors.lastname: Silva
authors.forename: Antonio G P
authors.initials: AG
authors.lastname: Ferreira
authors.forename: Clarice N L
authors.initials: CN
authors.lastname: Morais
authors.forename: Yara M
authors.initials: YM
authors.lastname: Gomes
mesh_terms: D000953:Antigens, Protozoan / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D002598:Chagas Cardiomyopathy; D014355:Chagas Disease / Q000145:classification / Q000175:diagnosis* / Q000276:immunology* / Q000503:physiopathology; D002908:Chronic Disease; D018450:Disease Progression; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood*; D011379:Prognosis; D015800:Protozoan Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics; D014349:Trypanosoma cruzi / Q000276:immunology* / Q000472:pathogenicity
chemical_list: D000953:Antigens, Protozoan; D007075:Immunoglobulin M; D015800:Protozoan Proteins; D011994:Recombinant Proteins; C060967:cytoplasmic antigen, Trypanosoma; C052356:flagellum-specific antigen, Trypanosoma